Coated hollow three-dimensional material preparation method and product and application thereof

A hollow, three-dimensional technology, applied in the field of coating hollow three-dimensional materials, can solve the problems of poor electrical conductivity, poor cycle performance, etc., and achieve the effect of increasing specific capacity, excellent electrochemical performance, and improving specific surface area

Inactive Publication Date: 2019-08-02
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain a large number of Prussian blue analogs at low temperature, the poor conductivity of Prussian blue analogs and the side reaction with organic electrolytes at high voltages lead to poor cycle performance when used as anode materials for sodium-ion batteries.

Method used

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  • Coated hollow three-dimensional material preparation method and product and application thereof

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Embodiment 1

[0022] This embodiment provides a method for preparing poly-3,4-ethylenedioxythiophene-coated ferromanganese Prussian blue analogs, which includes the following steps (wherein the centrifugation conditions described in each step are 10000r / min centrifugation for 10 minutes , the washing conditions are all 50vol% ethanol solution): step 1, get 4mmol manganese chloride and 8mmol sodium citrate and dissolve them in 100mL deionized water, and record it as solution ①; dissolve 2mmol sodium ferricyanide in 100mL deionized water , recorded as solution ②, under the condition of rapid stirring of solution ①, slowly drop solution ② into it, stir at room temperature (25°C) for 0.5 hours, age and stand for 24 hours, then centrifuge, and use ethanol solution to dissolve the precipitate obtained by centrifugation Washing, centrifuging the precipitate after washing and drying the solid matter in a 40°C oven for 24 hours to obtain ferromanganese Prussian blue analog nanocube material;

[0023...

Embodiment 2

[0027] This embodiment provides a method for preparing poly-3,4-ethylenedioxythiophene-coated ferromanganese Prussian blue analogs, which includes the following steps (wherein the centrifugation conditions described in each step are 10000r / min centrifugation for 20 minutes , the washing conditions are all 50vol% ethanol solution): step 1, get 3mmol manganese chloride and 6mmol sodium citrate and dissolve them in 100mL deionized water, and record it as solution ①; dissolve 2mmol sodium ferricyanide in 100mL deionized water , recorded as solution ②, under the condition of rapid stirring of solution ①, slowly drop solution ② into it, stir at room temperature (25°C) for 1 hour, age and stand for 12 hours, then centrifuge, and use ethanol solution to remove the precipitate obtained by centrifugation Washing, centrifuging the precipitate after washing and drying the solid matter in a 40°C oven for 24 hours to obtain ferromanganese Prussian blue analog nanocube material;

[0028] Ste...

Embodiment 3

[0031]This embodiment provides a preparation method of poly-3,4-ethylenedioxythiophene-coated ferromanganese Prussian blue analogue, which includes the following steps (wherein the centrifugation conditions described in each step are 9000r / min centrifugation for 10 minutes , the washing conditions are all 75vol% ethanol solution): step 1, get 4mmol manganese chloride and 10mmol sodium citrate and dissolve them in 100mL deionized water, which is recorded as solution ①; 3mmol sodium ferricyanide is dissolved in 100mL deionized water , recorded as solution ②, under the condition of rapid stirring of solution ①, slowly drop solution ② into it, stir at room temperature (25°C) for 0.5 hours, age and stand still for 24 hours, and centrifuge, and wash the precipitate obtained by centrifugation with ethanol solution, The solid matter obtained by centrifuging the precipitate after washing is placed in a 40°C oven and dried for 24 hours to obtain the ferromanganese Prussian blue analog na...

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Abstract

The invention discloses a coated hollow three-dimensional material preparation method and a product and application thereof. The method comprises the following steps: step 1, preparing a ferromanganese Prussian blue analogue nano-cube material; step 2, performing hydrochloric acid etching on the ferromanganese Prussian blue analogue nano-cube material obtained in the step 1; and step 3, coating the etched ferromanganese Prussian blue analogue nano-cube material with 3, 4-ethylene dioxythiophene monomer, wherein the poly 3,4-Ethylene dioxythiophene-coated ferromanganese Prussian blue analogue product prepared by the method can be applied to an electrode. The preparation method has the advantages of simple process, mild conditions and low preparation cost.

Description

technical field [0001] The invention belongs to the fields of electrochemistry and new energy materials, and in particular relates to a method for preparing a coated hollow three-dimensional material and its products and applications. Background technique [0002] Prussian blue compounds can be used as anode materials for sodium-ion batteries with an open framework structure. It belongs to metal-organic framework (MOF). The metal and ferricyanide in the lattice are arranged according to M—N≡C—Fe to form a three-dimensional structural framework. Fe ions and metal M ions are arranged in a cube, and C≡N cyanide is located in a cube on the edge. This type of material belongs to the cubic crystal system, which has three-dimensional sodium ion intercalation channels. It has three main advantages: (1) the rigid frame structure and open large pores and sites ensure that sodium ions with large ionic radii can be reversibly intercalated; (2) because of the redox reaction with two el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/054H01M4/13
CPCH01M4/13H01M4/366H01M4/60H01M4/624H01M4/628H01M10/054H01M2004/021H01M2004/028Y02E60/10
Inventor 张旗梁建东刘晓彭祥
Owner WUHAN INSTITUTE OF TECHNOLOGY
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